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Secondary labels are displayed below the labels of each menu item.

This and the CLs in the same chain are introduced to support the
use case in this mock:
https://screenshot.googleplex.com/si2PPQSzV1w


Bug: 1044038
Change-Id: I17535582c700ee83d95e077a15066542de13d925
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2208976
Commit-Queue: Mohamed Amir Yosef <mamir@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#770798}